<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			/*.a:hover{
				color: red;
			}
			.b:hover{
				color:gold;
			}*/
			div{
				width: 200px;
				height: 200px;
				background-color: red;
			}
			.c:hover{
				color: green;
			}
			.c:active{
				color: gold;
			}
			input:focus{
				background-color: red;
			}
			textarea:focus{
				background-color: gold;
			}
		</style>
	</head>
	<body>
		<input type="text" />
		<input type="password" />
		<textarea name="abc" rows="10" cols="20"></textarea>
		<div class="c">123123
			
		</div>
		<!--<a class="a" href="https://www.bilibili.com/">蔡徐坤</a>
		<a class="b" href="https://www.bilibili.com/">张翰</a>-->
	</body>
</html>